UNION ALL query: “Too Many Fields Defined”

Question

I\'m trying to get a UNION of 3 tables, each of which have 97 fields. I\'ve tried the following:

select * from table1
union all
select * from table2
union a         


        

Answer 1

Perhaps if your 3 tables have duplicate records you can go with UNION instead of UNION ALL which may reduce the number of fields to be tracked. Because UNION will always serve the business purpose which removes duplicates. In that case your query will be like following,

select * from table1
union
select * from table2
union
select * from table3;